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Finding the Fourth Proportional to 311.49, 467.43 and 211.53

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Solution

The fourth proportional to 311.49, 467.43 and 211.53 is: 317.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.49 : 467.43 = 211.53 : x
  2. Step 2: Convert to fraction form
    311.49/467.43 = 211.53/x
  3. Step 3: Cross multiply
    311.49x = 467.43 × 211.53
  4. Step 4: Simplify right side
    311.49x = 98,875.47
  5. Step 5: Solve for x
    x = 98,875.47/311.49
  6. Step 6: Final answer
    x = 317.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.